package com.cscp.javastudy.juc.unsafethread;

import java.util.Set;
import java.util.UUID;
import java.util.concurrent.CopyOnWriteArraySet;

/**
 * ConcurrentModificationException
 * 1- Set<String> set = Collections.synchronizedSet(new HashSet<>());
 * 2- Set<String> set = new CopyOnWriteArraySet<>();
 */
public class SetDemo1 {
    public static void main(String[] args) {
        Set<String> set = new CopyOnWriteArraySet<>();

        for (int i = 1; i <= 10; i++) {
            new Thread(() -> {
                set.add(UUID.randomUUID().toString().substring(0,5));
                System.out.println(set);
            }, String.valueOf(i)).start();
        }
    }
}
